Volkswagen Touran Service Manual: Refrigerant R134a
Refrigerant R134a Physical Data
| Vehicle air conditioning systems make use of the
vaporization and condensation process. In this case, one works
with a substance which boils easily, designated as refrigerant. |
| The refrigerant employed is tetrafluoroethane R134a, which
boils at -26.5 C (-15.7 F) at a vapor pressure of 1 bar (14.5
psi). |
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| Chemical formula |
CH2FCF3 or CF3CH2F |
| Chemical designation |
Tetrafluoroethane |
| Boiling point at 1 bar
(14.5 psi) |
-26.5 C (-15.7 F) |
| Solidification point |
-101.6 C (-150.88 F) |
| Critical temperature |
100.6 C (213 F) |
| Critical pressure |
40.56 bar absolute (588 psi)
equals 39.5 bar pressure (573 psi) |
Critical Point
| Vehicle air conditioning systems make use of the
vaporization and condensation process. In this case, one works
with a substance which boils easily, designated as refrigerant. |
| The refrigerant employed is tetrafluoroethane R134a, which
boils at -26.5 C (-15.7 F) at a vapor pressure of 1 bar (14.5
psi). |
| The critical point (critical temperature and critical
pressure) is that above which there is no longer a boundary
between liquid and gas. |
| A substance above its critical point is always in the
gaseous state. |
| At temperatures below the critical point, all types of
refrigerant in pressure vessels exhibit both a liquid and a gas
phase, i.e. there is a layer of gas above the liquid. |
| As long as there is still gas present in the container next
to the fluid, pressure is dependent on ambient temperature.
Refer to
→ Chapter "Refrigerant R134a Vapor Pressure Table". |
 Note
| Different types of refrigerant are never to be mixed. Only
the refrigerant designated for the corresponding A/C system may
be used. |
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Refrigerant R134a Environmental Information
| Vehicle air conditioning systems make use of the
vaporization and condensation process. In this case, one works
with a substance which boils easily, designated as refrigerant. |
| The refrigerant employed is tetrafluoroethane R134a, which
boils at -26.5 C (-15.7 F) at a vapor pressure of 1 bar (14.5
psi). |
| R134a is a fluorocarbon and contains no chlorine. |
| R134a has a shorter atmospheric life span than refrigerant
R12. |
| R134a does not damage the ozone layer. The ozone depletion
potential is zero. |
| The greenhouse potential of R134a (Global Warming Potential
= GWP) is approximately 1430 (the GWP of carbon dioxide is 1). |
| The global warming effect of R134a is ten times less than
that of refrigerant R12. |
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The vapor pressure table for every refrigerant is published
in literature for refrigeration system engineers. This table
makes it possible to determine the vapor pres ...
Commercial Names and Designations
Refrigerant R134a is currently available under the following
trade names:
H-FKW 134a
...
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Refrigerant R134a Vapor Pressure Table
Refrigerant R134a Characteristics